Structure of an HIF-1alpha -pVHL complex: hydroxyproline recognition in signaling.
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Min JH, Yang H, Ivan M, Gertler F, Kaelin WG Jr, Pavletich NP
Structure of an HIF-1alpha -pVHL complex: hydroxyproline recognition in signaling.
Science. 2002 Jun 7;296(5574):1886-9. Epub 2002 May 9.
- PubMed ID
- 12004076 [ View in PubMed]
- Abstract
The ubiquitination of the hypoxia-inducible factor (HIF) by the von Hippel-Lindau tumor suppressor (pVHL) plays a central role in the cellular response to changes in oxygen availability. pVHL binds to HIF only when a conserved proline in HIF is hydroxylated, a modification that is oxygen-dependent. The 1.85 angstrom structure of a 20-residue HIF-1alpha peptide-pVHL-ElonginB-ElonginC complex shows that HIF-1alpha binds to pVHL in an extended beta strand-like conformation. The hydroxyproline inserts into a gap in the pVHL hydrophobic core, at a site that is a hotspot for tumorigenic mutations, with its 4-hydroxyl group recognized by buried serine and histidine residues. Although the beta sheet-like interactions contribute to the stability of the complex, the hydroxyproline contacts are central to the strict specificity characteristic of signaling.